Gun sight



March 22, 1932.

C. W. ROBBINS GUN S IGHT Filed March '14, 1929 ya M Patented Mar. 22, 1932 EQE CHARLES W. ROBBINS, F MANOR, PENNSYLVANIA GUN SIGHT Application filed. March 14, 1929. Serial No. 347,074.

In target practice or shooting, it is important for accuracy of aim that the bullseye or target shall be symmetrically within the sight opening. Bulls-eyes vary in size or diameter so that a sight having an aperture or opening of fixed area while available for a bulls-eye of a size that may be symmetrically circumscribed by the opening or aperture, is not suitable for a bulls-eye which cannot be so circumscribed. An important object of my invention is to provide a sight and particularly though not necessarily, a front sight so constructed as to permit adjustment of the size of tl e sight opening or aperture?accordingteme size of the bullseyea'iid whichwill"beo'ffiifipleand inexpensive-construction and easy of manipulation or adjustment.

In the drawings Fig. 1 is a perspective view of a front sight embodying my invention with full lines showing one position of the parts and the dotted lines another position;

Fig. 2 is a transverse section thereof.

The embodiment of my invention shown in the drawings comprises a base plate, 10, adapted to be secured to the top of the gun barrel at the front in rear of the muzzle and a tubular light shield, 11, whose axis extends parallel with the axis of the gun barrel, and which is connected with and supported from the top of the base plate at the transverse center of the latter by a rib, 12, which supports the shield, 11, a short distance above the top of the base, 10. Upon opposite sides of the rib, 12, there are two similar blocks, 13, that are slidable towards and from one another transversely of the gun barrel and from each there extends upward and into the shield, 11, an arm, 14, which at its upper end carries a plate, 15, conveniently made substantially semi-circular in form and having an angular notch, 16, the angular notch of one plate being opposite that of the other plate and the two plates being in planes along side of one another, so that by the movement of the blocks, 13, said plates may be moved towards and from one another and to an extent which will vary the diameter of the sight opening or aperture defined by the square or rectangular outline of the two notches. Said plates may also be moved so far apart as to permit the use of a post sight which is provided in the form of a bar, 17, that at one end is pivoted in a longitudinal groove or recess, 18, in the upper side of the rib, 12, so that said bar may be turned between a vertical position for use as a sight and a horizontal position lying in the groove, 18, where it will not interfere with the full use of the sight opening.

The shield, 11, is slotted in the lower part at each side to permit the passage therethrough of the sight-supporting arms, 14, and the movements of the latter back and forth.

For moving the blocks, 13, towards and from one another, they are provided with alining threaded holes for engagement respectively, by right and left threads on a rotary rod or shaft, 19, which has a swiveled mounting in the rib, 12, which permits free rotation without longitudinal movement and at the end said rod or shaft, 19, has a suitable turning button or head, 20. The shaft holds the blocks from turning on the base.

I prefer the square or rectangular form of sight opening because the straight sides thereof being adjusted to be tangent to the circumference of the bulls-eye, will symmetrically define the latter with angular spaces produced by the corners of the square openmg.

However, I do not confine or restrict the scope of my protection to any particular form of sight opening, nor to the particular construction and arrangement of parts shown in the drawing, as changes therefrom in many respects may be made which will be within the scope of my invention.

As will be evident, my invention may be employed with a telescope sight which is mounted at the breech end of the gun and including a horizontally extending tube above the barrel. In such a case, it would be necessary merely to provide means for attaching the base to the forward end of the telescope tube and the members having the sight aperture would be situated in advance of the front end of the telescope. The base could be 105 attached to a split clamp ring that would fit over the telescope tubes and be clamped thereon.

What I claim is 1. A gun-sight having a base, sight opening carrying blocks movable towards and from one another and providing a space when moved away from one another, each carrying a member that defines a part of the sight opening and right and left screw means acting on said blocks, and a post sight mounted in the space between said members provided by the separation of said members.

2. A gun-sight comprising notched members movable towards and from one another and providing a space when moved away from one another, the notches in the members providing the edges of a sight opening, said members being movable to graduate the size of the sight opening and also to completely separate them and a post sight mounted in the space between said members when separated.

In testimony whereof I hereunto affix my signature.

CHARLES W. ROBBINS. 

